#!/usr/bin/python3

import turtle

myscreen = turtle.Screen()
myturtle = turtle.Turtle()

def draw_square(side):
    for count in range(4):
        myturtle.forward(side)
        myturtle.left(90)

draw_square(50)
myturtle.back(50)
draw_square(100)
myturtle.back(50)
draw_square(150)
myturtle.back(50)
draw_square(200)
myscreen.exitonclick()